Question about 2004 Chevrolet TrailBlazer

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2003 Chevrolet Trailblazer 4.2L I6 76K miles - started pulling a code for a misfire on cylinder 5; replaced coil for that cylinder and replaced all spark plugs. It runs worse now and is pulling the P0300 multiple/random cylinder misfires. Service Engine Soon light is on and blinking. Any suggestions would be helpful; doesn't seem like the converter is plugged. Thanks,

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  • 1,123 Answers

With a service engine light blinking...don't drive it.

When replacing the spark plugs, double check that the boots on the coils are installed correctly. Check these again, and make sure to either listen for or feel a little click which tells you it's properly seated on the top of the spark plug. This is a common thing, happens all the time to people with TB's and Envoys. I've even done this myself.

In case you didn't know, # 1 cylinder is up front near the fan, then it runs in order to #6 at the firewall. Possibility....(don't take this as doubting you), maybe the wrong coil was replaced and one or more coil boots weren't set properly? Some things to check anyway.

Posted on Mar 25, 2011

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2 Answers

03 chevy trailblazer, hooked up a code scanner and shows multiple random misfires doesn't give specific cylinder. p0300 code. I changed the spark plugs. no help.


Pull the coil plugs when running. One at a time. If the engine gets worse the coil is good. No difference. Most likely the coil is bad. To check it again, swap it with another. Pull the plug on the suspected bad one. If it gets worse, look to wiring at the one that was no deference. Check for power to the plug.

Dec 23, 2016 | 2003 Chevrolet TrailBlazer

1 Answer

2003 trailblazer misfiring and idling low i can't even turn my heat or air on when setting still or it want die we had it checked with the sessions light at advance auto parts read cylinder 2 mis fire and...


Your checking for codes & throwing parts at it

Your NOT diagnosing anything like the cylinder
misfires, because you don't have OBD2 System
knowledge or the proper professional tools to work
on it, or Chevy Trailblazer Powertrain experience

Best left to a repair shop

Mar 10, 2014 | 2003 Chevrolet TrailBlazer

2 Answers

Replaced 2 coil packs and still running rough 2003 trailblazer


try replacing or cleaning the injectors
when misfiring moves around it is seldom the coils , plugs and any thing else connected to spark but dirty fuel, low fuel pressure and dirty injectors or injector control
use a quality injector cleaner for a few tankfills

Sep 02, 2012 | 2003 Chevrolet TrailBlazer

2 Answers

I changed the plugs and wires on my 2003 trailblazer. I gapped the spark plugs @ .040 and checked all of the connections. Now my engine skips. It gave a 0300 code ( multiple cylinder misfire). Any...


if its a multiple missfire then i would suspect your fuel pressure is dropping or your regulator has failed and is sucking too much fuel causing the computer to overcompensate, these engines are also known for intake leaks

Mar 28, 2011 | 2003 Chevrolet Trailblazer Ext

1 Answer

I have a code on my trailblazer p0300 how can i fix this problem.thank you.


This is a random/multiple cylinder misfire. Last time I had this problem, it was my coils. Try checking your coils first.

Dec 07, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Misfire in cylinder # 5 I have already replaced the coil any other ideas?


Could indicate a burnt or warped valve, a worn cam lobe, or it may be pumping oil to the top of the cylinder and drowning or accumulating on the spark plug.

Jul 02, 2010 | 2003 Chevrolet Trailblazer Ext

1 Answer

I have a 2003 chevy trailblazer that has a error code that states the #5 cylinder is misfiring, what does that mean?


The computer has detected a misfire on cylinder number 5.In mosts circumstances when I have run across this on the Envoy and Trailblazer.It is a failed coil pack.Easiest way to check would be to swap cylinder 5 coil with another coil and see if it follows to the cylinder that you swapped with.

Jun 12, 2010 | 2003 Chevrolet Trailblazer Ext

1 Answer

I have a 2002 TrailBlazer with the straight 6,diognostic check said #3 cylinder was dead or misfiring, also map sensor showed up. #3 cylinder was misfiring, so to test the coil pack I swapped #3 coil pack...


did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
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1 Answer

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Check the code and see which cylinder is the one that is missing.Then remove that coil and check the plug.The coils are known to go bad on these vehicles.To make sure you can swap it with another coil if the misfire changes to another cylinder then replace the one that is causing the misfire.Hope this helps.

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